Airlift bioreactors for bioremediation of water contaminated with hydrocarbons in agricultural regions
INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING(2024)
Abstract
The superficial gas velocity (Ug) values of 1.0, 1.5 and 2.0 cm s-1 showed a diesel consumption of 59.70, 58.20 and 65.20 %, respectively. The productivity of the airlift bioreactors (ALBs) was 0.030, 0.026 and 0.034 g L-1 d-1, respectively. During 10 days of operation, the emulsification index (E 24 %) values for Ug 1.0, 2.0 and 2.0 cm s-1 were 15.79, 15.07 and 12.85 %, respectively. Likewise, an increase in the degradation and suspended solids was observed when increasing the Ug from 1.0 to 2.0 cm s-1 of the ALBs, whereas a decrease in emulsification index E 24 % was observed for an Ug of 2.0 cm s-1. According to the results, the Ug of 2.0 cm s-1 was the most effective for increasing the degradation of diesel and growth of the consortium among the Ug evaluated. Furthermore, the reduction of E 24 % in this Ug suggests that the consortium uses a mixed form of hydrocarbon consumption, both by direct contact and in emulsified form.
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Key words
airlift bioreactors,bioremediation,pollution,polycyclic aromatic hydrocarbon,water bodies
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